Xiongnu Confederacy

The Xiongnu Confederacy (209 BC-93 AD) was a large empire of nomads from present-day Mongolia, China, Kazakhstan, and Kyrgyzstan. The empire raided China to the south repeatedly, and at the 200 BC Battle of Baideng their leader Modu defeated Liu Bang and forced him to marry his daughter to him. The confederacy disintegrated in 93 AD.

History
The Xiongnu people were a Mongolic nomadic people from northern Asia, and they were known to be powerful horsemen. The Xiongnu initially traded horses with the people of China to the south, but in 209 BC Modu conquered the Dingling and other neighboring tribes, founding an empire of the Xiongnu tribes. He invaded China and defeated Emperor Liu Bang of the Han dynasty at the 200 BC Battle of Baideng, but the Xiongnu fortunes waned during the Eastern Han period. In 89 AD they were defeated at the Battle of the Altai Mountains by Dou Xian, and their last leader Yuchujian Chanyu was killed in 93 AD.